Christie posted the ad on Twitter, saying it will air across the nation.
"You know, lying in isolation in ICU for seven days, I thought about how wrong I was to remove my mask at the White House. Today, I think about how wrong it is to let mask-wearing divide us," Christie says in the ad.
The former governor got infected in October after he attended a ceremony at the White House where few people wore masks.
It's unclear how Christie got the virus, but he urged Americans to "learn from his experience."
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